Pet door



FIG. 1 is a front, right side, top perspective view of a pet door showing my new design;

FIG. 2 is a rear, left side, bottom perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof, the right side elevational view thereof being substantially a mirror image;

FIG. 6 is a top plan view thereof, the bottom plan view thereof being substantially a mirror image; and,

FIG. 7 is an enlarged detailed view of the region circled 7 in FIG. 1.

The broken lines depict portions of the pet door that form no part of the claimed design. 

CLAIM The ornamental design for a pet door, as shown and described. 